Cortinarius Infractus

Cortinarius infractus, known as the Bitter Webcap, is a widespread woodland mushroom found across Europe and North America, easily recognized by its dusky olive-brown colors and distinctively bitter taste. Although it belongs to the large and often toxic genus Cortinarius, C. infractus is notable not for edibility but for its potential medicinal compounds, including infractopicrin, a compound with reported MAO-inhibiting effects.

History

First described in the 18th century, this species has long been recognized for its distinctive morphology and inedibility. Its intense bitterness led to early classifications emphasizing its unpalatable nature, and it was often used in mycological education as a textbook example of non-edible forest fungi.

In recent decades, C. infractus has gained scientific interest due to its bioactive alkaloids, particularly those with neuroactive properties. However, due to the risk of confusion with highly toxic Cortinarius species, it is not recommended for casual foraging.

Overview

The mushroom features a convex to flat cap (4–10 cm across), olive-gray to brown in color, with a sticky surface in wet conditions. The gills are grayish to rusty brown and are covered in a cobweb-like cortina when young. The stem is often thick and shares the same drab coloration as the cap.

It thrives in coniferous and deciduous forests, growing from the soil and forming ectomycorrhizal relationships with trees. While inedible, it is studied in pharmacognosy and natural product chemistry for its psychoactive potential—though it must be approached cautiously due to genus-wide toxicity concerns.